[mono.treme] n [NL Monotremata, fr. Gk mon- + tremat-, trema hole--more at trematode] (1835): any of an order (Monotremata) of egg-laying mammals comprising the platypuses and echidnas
MONOTREME
Meaning of MONOTREME in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012